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vfio/type1: Initialize resv_msi_base 

After enabling CONFIG_IOMMU_DMA on X86 a new warning appears when
compiling vfio:

drivers/vfio/vfio_iommu_type1.c: In function ‘vfio_iommu_type1_attach_group’:
drivers/vfio/vfio_iommu_type1.c:1827:7: warning: ‘resv_msi_base’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   ret = iommu_get_msi_cookie(domain->domain, resv_msi_base);
   ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The warning is a false positive, because the call to iommu_get_msi_cookie()
only happens when vfio_iommu_has_sw_msi() returned true. And that only
happens when it also set resv_msi_base.

But initialize the variable anyway to get rid of the warning.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Joerg Roedel 2019-10-15 17:16:50 +02:00 committed by Alex Williamson
parent 4f5cafb5cb
commit 95f89e0906
1 changed files with 1 additions and 1 deletions
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2
drivers/vfio/vfio_iommu_type1.c
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@ -1658,7 +1658,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
struct bus_type *bus = NULL;
int ret;
bool resv_msi, msi_remap;
phys_addr_t resv_msi_base;
phys_addr_t resv_msi_base = 0;
struct iommu_domain_geometry geo;
LIST_HEAD(iova_copy);
LIST_HEAD(group_resv_regions);